Cell Cycle and Cell Division

EXERCISE – I (Conceptual Question) Build Up your Understanding 1. Which of the following not ocurs in Anaphase-I but occurs in Anaphase-II :(1) Condensation of chromosomes (2) Poleward movement of chromosome (3) Contraction of spindle fibers (4) Splitting of centromere 2. During G2 - phase a diploid cell contains the amount of DNA equal to a :(1) Diploid cell (2) Tetraploid cell (3) Haploid cell (4) None of the above 3. Crossing over takes place in :(1) Zygotene (2) Pachytene 4. 5. (3) Diplotene (4) Diakinesis A contractile mid body forms during cytokinesis in :(1) Animals (2) Higher plants (3) Fungi (4) Algae In which order, cytokinesis occurs in plants :(1) Centripetal (2) Centrifugal (3) Oblique (4) Equatorial 6. Which of the two events restore the normal number of chromosomes in life cycle ? (1) Mitosis and Meiosis (2) Meiosis and fertilisation (3) Fertlisation and mitosis (4) Only meiosis 7. Match the column-I with column-II and select the correct answer:Column-1 Column-II (A) Pachytene (i) Bouquet stage (B) Zygotene (ii) Chiasma visible (C) Diplotene (iii) Terminalisation (D) Leptotene (iv) Gene exchange (E) Diakinesis (v) Synapsis (1) A-i, B-ii, C-iii, D-iv, E-v (2) A-iv, B-v, C-ii, D-i, E-iii (3) A-iii B-iv C-v D-ii E-I (4) A-ii, B-iii, C-iv, D-i, E-v 8. Which part of plant is suitable for the study of meiosis (1) Root apex (2) Ovary (3) Anther (4) Shoot apex Chromosomal movement in Anaphase occurs with the help of :(1) Astral rays (2) Centrioles (3)NOR (4) Spindle fibres Nuclear envelope reappears at :(1) Metaphase (2) Prophase (4) Telophase 9. 10. 11. (3) Anaphase Slipping of chiasmata towards the ends of bivalent is called :(1) Terminalisation (2) Diakinesis (3) Interkinesis (4) Congression 12. 13. In meiosis, how many cycles of chromosome division occurs? (1) One (2) Four (3)Two (4)Three Which does not occurs in prophase ? (1) Decondensation of chromatin (2) Condensation of chromatin (3) Appearance of chromosome (4) Disappearance of nuclear membrane and nucleolus 14 . In which. stage of cell division, number of chromosomes best counted:(l) Prophase (2) Metaphase (3) Telophase (4) Interphase 15. How many chromosome shall be present in a diploid cell at mitotic anaphase if its egg cell has ten, chrompsome:(1) 10 (Ten) (2) 20 (Twenty) (3) 30 (Thirty) (4) 40 (Forty) 16. Chromosome exhibit high level of coiling at which phase of karyokinesis : (1) Prophase (2) Metaphase (3) Telophase (4) Interphase 17. "Bouquet-stage" occur in which sub stages of prophase -I ? (1) Leptotene (2) Zygotene (3) Pachytene (4) Diplotene At anaphase - II of meiosis each chromosome contains:(1) 4 DNA (2) 3 - DNA (3) 2- DNA (4) 1- DNA 18. 19. In which stage of mitosis, the chromosomes are composed of two chromatids ? (1) Prophase & metaphase (2) Anaphase and telophase (3) Prophase and telophase (4) Metaphase and anaphase 20. In Anaphase- I each chromosome composed of:(1) One chromatid (2) Two chromatid (3) Four chromatid (4) Many chromatid 21. Gap between division phase and start of DNA-replication is called :(1) G1 - phase (2) G2 – phase (3) M- phase (4) Interkinesis 22. In meiosis, division of centromere occurs during:(1) Interphase (2) Anaphase- I (3) Anaphase - II (4) Metapqase - I In meiosis, nuclear membrane and nucleolus disappear during: (1) Zygotene (2) Pachytene (3) Diakinesis (4) Metaphase - I In cell cycle, which stage is misnomerly called resting phase : (1) S-phase (2) Telophase (3) Cytokinesis (4) Interphase 23. 24. 25. Separation of homologous chromosomes during Anaphase - I is called :(1) Synapsis (2) Disjunction (3) Nondisjunction (4) Crossing over 26. During cell division, spindle fibers attach to which part of chromosome :(1) Primary constriction (2) Secondary constriction (3) Telomere (4) Satellite 27. Diakinesis represents :(1) transition to prophase (3) transition to anaphase (2) transition to metaphase (4) transition to telophase 28. Synaptonemal complex is characteristic of : (1) Mitotic chromosomes (2) Leptotene chromosomes (3) Paired meiotic chromosomes (4) Metaphase 29. During which stage a diploid cell becomes tetraploid in mitosis:(1) G2 (2) Prophase (3) Metaphase (4) Anaphase Division of centromere occurs in: (1) Prophase (2) Metaphase (4) Telophase 30. 31. (3) Anaphase Each chromosome composed of one chromatid in: (1) Anaphase -I (2) Anaphase - II (3) Metaphase - I (4) Metaphase - II 32. If the number of bivalents are 8 in metaphase -I, what shall be the number of chromosomes in daughter cells after meiosis - I ~nd meiosis – II respectively:(1) 8 and 4 (2) 4 and 4 (3) 8 and 8 (4) 16 and 8 33. Which one of the following statements is correct ? (1) Cell divided by cytokinesis only in mitosis (2) DNA is replicated before the start of meiosis only (3) Spindles consisting of microtubules are formed only in mitosis (4) Exchange of genetic materials occurs only in meiosis 34. Which of the following not occurs in Anaphase -1 (1) Segregation of homologous chromosomes (2) Shortening spindle (3) Poleward movement of chromosomes (4) Division of centromere 35. In meiosis : (1) Division of nucleus twice but replication of DNA only once (2) Division bf nucleus twice and replication of DNA twice (3) Division of nucleus once and replication of DNA is also once (4) Division of nucleus once and DNA- replication is twice 36. After meiosis - I, the two chromatids of a chromosome are :(1) Genetically similar (2) Genetically different (3) There occurs only one chromatid in each chromosome (4) None of the above 37. Chiasmata appears during :(1) Diakinesis (2) Synaptotene (3) Diplotene (4) Leptotene 38. What happens in synthesis phase during cell cycle: (1) DNA synthesis (2) Chromosome number becomes double (3) Formation of two nuclei (4) Synthesis of tubulin proteins_ 39. Reappearance of nuclear membrane & nucleolus along with thining_&_elongation in chromosomes are diagnostic characters for the phase:(1) Anaphase (2) Metaphase (3) Interphase (4)Telophase 40. Condensation of chromosomes and appearance of astral rays occur during:(1) Prophase (2) Metaphase (3) Anaphase (4) Telophase 41. During telophase:(1) Nuclear membrane is formed (3) Astral rays disappear 42. 43. 44. 45. (2) Nucleolus appears (4) All the above Chromosomal morphology (Structure) is best observed at:(1) Prophase (2) Metaphase (3) Interphase (4) Anaphase Pairing of homologous chromosomes is called:(1) Disjunction (2) Synapsis (3) Segregation (4) Polyteny Preparation phase of mitosis is :(1) G1-phase (2) 5-phase (3) Prophase (4) Interphase Synaptonemal complex first appear :(1) Leptotene (2) Pachytene (3) Zygotene (4) Diplotene 46. The correct sequence of prophase-! of meiosis is : (1) Leptotene, pachytene, zygotene, diplotene, diakinesis (2) Leptotene, diplotene, pachytene, zygotene, diakinesis (3) Leptotene, zygotene, pachytene, diplotene, diakinesis (4) Leptotene, zygotene, diakinesis, diplotene 47. M-phase of cell cycle consist of :(1) G1 , Sand G2 phase (2) Prophase, Metaphase, Anaphase, Telophase (3) Interphase, Prophase, Metaphase, Anaphase; Telophase (4) Only prophase 48. If the cell is diploid in G1 than after the S phase cell remain/become : (1) n (2) 4n (3) 8n (4) 2n 49. 50. 51. 52. 53. Nuclear membrane disappears in :(1) Late prophase (2) Early prophase (3) Metaphase (4) Telophase Pre-DNA synthesis phase is:(1) G1 - phase (2) G2 – phase (3) S-phase (4) Prophase Which of the following is called heterotypic division:(1) Meiosis-I (2) Meiosis-II (3) Mitosis (4) Amitosis DNA replication is found in:(1) Mitosis and meiosis-I (3) Meiosis only (2) Mitosis and meiosis-I and meiosis-II (4) Mitosis only Thick-thread stage occured in :(1) Leptotene (2) Zygotene (3) Pachytene (4) Diplotene 54. How many times divisions will occur in an isolated tip cell to form 128 cells ? (1) 128 (2) 127 (3) 32 (4) 7 55. In which stage the DNA is doubled :(1) Metaphase (2) Anaphase (3) Interphase (4) Prophase 56. The significance of Meiosis is that it (1) Produce four cells having chromosomal numberequal to mother cell (2) Occurs in all types of cells (3) Maintains the constant Chromosomes number to a particular species (4) Growth of animal body ograns 57. Cell cycle of an ordinary animal cellMitosis Fertilization Meiosis  n   2n   2n (1) 2n  Meiosis Fertilization Mitosis (2) n  2n  2n  n Meiosis Fertilization Mitosis  n   2n   2n (3) 2n  Fertilization Mitosis Meiosis (4) 2n  (n)  2n  n 58. The number of DNA in chromo-some at G2 state of cell cycle :(1) One (2) Two (3) Four (4) Eight 59. Crossing over that results in genetic recombination in higher organisms occurs between(1) Non-sister chromatids of a bivalent (2) Two daughter nuclei (3) Two different bivalents (4) Sister chromatids of a bivalents 60. In the somatic cell cycle :(1) DNA replication takes place in 5-phase (2) A short interphase is followed by a long mitotic phase (3) G2 phase follows mitotic phase (4) In G1 phase DNA content is double the amount of DNA present in the original cell 61. When synapsis is complete all along the chromosome, the cell is said to have entered a stage called. (1) Zygotene (2) Pachytene (3) Diplotene (4) Diakinesis 62. Many cells function properly and divide mitotically even through they do not have :(1) Plasma membrane (2) Cytoskeleton (3) Mitochondria (4) Plastids 63. Centromere is required for (1) Movement of chromosomes towards poles (2) Cytoplasmic cleavage (3) Crossing over (4) Transcription 64. At which stage of the cell cycle are histone proteins synthesized in a eukaryotic cell ? (1) During telophase (2) During 5-phase (3) During G2-stage of prophase (4) During entire prophase 65. If the n = 16 in plant cell then what is possible in metaphase - I of meiosis ? (1) 32 Bivalents (2) 16Telravalehts (3) 16 Bivalents (4) 32 Bivalents 66. Prophase which follows the S and G2 phases of interphase, is the first stage of :(1) Meiosis-II (2) Karyokinesis (3) Interphase (4) G1 phase 67. The two asters together with spindle fibres form:(1) Mitotic apparatus (2) Asters (3) Astral fibres (4) Centrosome 68. In prophase centrosome which had undergone duplication during. interphase, begins to move towards: (1) Same poles of the cell (2) Opposite poles of the cell (3) One towards centre while another towards pole (4) Both towards centre 69. During prophase each centrosome radiqtes out microtubules called : (1) Mitotic apparatus (2) Spindle apparatus (3) Asters (4) Spindle fibres 70. Telophase is : (1) Final stage of karyokinesis (3) Mid stage of karyokinesis 71. (2) Final stage of mitosis (4) First stage of cytokinesis Which one of the following is most correct statement : (1) Chromatin material tends to collect in a mass in the two poles (2) Each set of chromatin material tends to collect at each of the two poles (3) Each set of chromatin material tends to collect at metaphasic plate (4) Chromatin material tends to collect in a mas at one pole 72. Nuclear envelop develops around the chromosome clusters at : (1) One pole (2) Centre (3) Each pole (4) Pole as well as centre both 73. Cytokinesis is : (1) Formation of cell wall (3) Separation of nucleoplasm (2) Formation of cell membrane (4) Separation of cytoplasm 74. Meiosis involves: (1) Pairing of homologous chromosomes and recombination between sister chromatids of nonhomologous chromosomes (2) Pairing of homologous chromosomes and recombination between nonsister chromatids of homologuus chromosomes (3) Pairing of nonhomologous chromosomes and recombination between nonsister chromatids of homologous chromosomes (4) Pairing of homologous chromosomes and recombination between sister chromatids of homologous chromosomes 75. In which on of the following stage, the four chromatids of each bivalent chromosomes-becomes distinct and clearly appears as tetrads. (1) Leptotene (2) Zygotene (3) Pachytene (4) Diplotene 76. Which one of the following statement is incorrect for interkinesis ? (1) It is the stage between the two subphases of a meiotic division (2) There is no replication of DNA (3) DNA replicate but chromosome number remains same (4) It is generally short lived. 77. At anaphase-II, sister chromatids move towards opposite poles of the cell by : (1) Contraction in spindle fibre attached to kinetochores (2) Shortening of microtubules attached to kinetochores (3) Lengthening of microtubules attached to kinetochores (4) Relaxation in spindle fibre attached to kinetochores 78. G0 (Quiscent) stage is : (1) Part of interphase (3) Part of G2 phase (2) Part of M-phase (4) Not a part of cell cycle In a slow dividing normal cell: (1) G1 phase is more longer than S phase (3) Both phases are equal in duration (2) S phase is more longer than G1 phase (4) Can't be determined 79. ANSWER KEY EXERCISE-I (Conceptual Question) 1. 8. 15. 22. 29. 36. 43. 50. 57. 64. 71. 78. (4) (3) (4) (3) (4) (2) (2) (1) (3) (2) (2) (4) 2. 9. 16. 23. 30. 37. 44. 51. 58. 65. 72. 79. (2) (4) (2) (3) (3) (3) (4) (1) (2) (3) (3) (1) 3. 10. 17. 24. 31. 38. 45. 52. 59. 66. 73. Power by: VISIONet Info Solution Pvt. Ltd Website : www.edubull.com (2) (4) (1) (4) (2) (1) (3) (1) (1) (2) (4) 4. 11. 18. 25. 32. 39. 46. 53. 60. 67. 74. (1) (1) (4) (2) (3) (4) (3) (3) (1) (1) (2) Mob no. : +91-9350679141 5. 12. 19. 26. 33. 40. 47. 54. 61. 68. 75. (2) (1) (1) (1) (4) (1) (2) (4) (2) (2) (3) 6. 13. 20. 27. 34. 41. 48. 55. 62. 69. 76. (2) (1) (2) (2) (4) (4) (4) (3) (4) (3) (3) 7. 14. 21. 28. 35. 42. 49. 56. 63. 70. 77. (2) (2) (1) (3) (1) (2) (1) (3) (1) (1) (2)